By Ayanjit Sen BBC correspondent in Delhi

Litter has become a major problem in Delhi

But that may be about to change.

Magistrates have now begun driving around the city in mobile courts to dispense justice on the litter louts.

The move comes after India's supreme court ordered Delhi to enforce anti-litter laws.

One of the city's sanitation commissioners - Ramesh Negi - told the BBC the magistrates would be holding court in open places like markets, roadside and parks.

Range of fines

The magistrates' vans have been equipped with temporary furniture such as chairs and tables to make their work easier.

The courts can impose heavy fines

Retired Colonel Aryaveer - a special magistrate who I watched holding court in one of the biggest markets in Delhi - said he has imposed fines ranging from one dollar to $20 for violating anti-litter laws.

"We are not here just to penalise the offenders but also to create an awareness to keep the city clean," he said.

One of the offenders, Ramesh - who runs a tea shop in a busy market in Delhi - said he had to give nearly $10 for dumping rubbish near his shop.

According to Indian laws, it is illegal to spit on the pavement and discard rubbish in plastic bags in the street or parks.

"But nobody follows these guidelines," said Rishal Singh, an official of the city's sanitation department.

He said residents have been asked to dispose of their litter in dustbins which would then be taken away by a road-sweeper to the nearest rubbish dumping site.

Health officials say litter thrown on the street is often picked up by stray cows, pigs and dogs which may lead to the spread of diseases.

Also, as the animals walk up and down on the rubbish and spread it around the streets it creates traffic hazards in congested areas of the city.